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<?php abstract class Filter { abstract public static function check($value, array $options = array()); } final class IntFilter { public static function check($value, array $options = array()) { return $value; } } final class StringFilter { public static function check($value, array $options = array()) { if (false === is_string($value)) { return false; } if (false !== ($options['trim'] ?? true)) { $value = trim($value); } $length = mb_strlen($value, '8bit'); if ((false === ($options['empty'] ?? true)) && (0 === $length)) { return false; } if (isset($options['max'])) { $maxLength = IntFilter::check($options['max'], ['min' => 1]); if ($length > $maxLength) { return false; } } if (isset($options['min'])) { $minLength = IntFilter::check($options['min'], ['min' => 1]); if ($length < $minLength) { return false; } } if (isset($options['startsWith'])) { $needle = StringFilter::check($options['startsWith']); if (false === self::startsWith($value, $needle)) { return false; } } if (isset($options['endsWith'])) { $needle = StringFilter::check($options['endsWith']); if (false === self::endsWith($value, $needle)) { return false; } } return $value; } private static function startsWith($haystack, $needle) { return $haystack[0] === $needle[0] ? strncmp($haystack, $needle, mb_strlen($needle, '8bit')) === 0 : false; } private static function endsWith($haystack, $needle) { $length = mb_strlen($needle, '8bit'); $haystack = mb_substr($haystack, -$length); return $haystack[0] === $needle[0] ? strncmp($haystack, $needle, $length) === 0 : false; } } var_dump(StringFilter::check(' r a ', ['empty' => false]));